It seems that ListModel now also sets the modelData property for delegates, in case there's only one role for each ListElement. Before, modelData was always undefined for ListModel types. This caused an issue in our application. See this example code:

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
  visible: true
  width: 640
  height: 480
  title: qsTr("ListModel with modelData")

  ListView {
    anchors.fill: parent
    model:   ListModel {
      ListElement {
          name: "Apple"
      }
      ListElement {
          name: "Orange"
      }
      ListElement {
          name: "Banana"
      }
    }

    delegate: Text {
      text: modelData
    }
  }
}

This example prints this names for the delegate text. When adding another role to a ListElement, modelData becomes undefined. Was this change planned, or do you consider this a bug?